Mitsubishi Galant. Manual — part 264

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-281

STEP 1. Using scan tool MB991502, check actuator test
item 08: Evaporative Emission Purge Solenoid.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the actuator test mode for item

08, Evaporative emission purge solenoid.

•

An operation sound should be heard and vibration
should be felt when the evaporative emission purge
solenoid is operated.

(4) Turn the ignition switch to the "LOCK"(OFF) position.

Q: Is the solenoid operating properly?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points(

P.00-8

).

NO : Go to Step 2.

STEP 2. Check connector B-04 at the evaporative emission
purge solenoid for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 12.

AC003081 AB

16 PIN

MB991502

ACX02514 AI

EVAPORATIVE
EMISSION
PUREGE
SOLENOID
VALVE

CONNECTOR:B-04

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-282

STEP 3. Check the evaporative emission purge solenoid.
(1) Disconnect the evaporative emission purge solenoid

connector B-04.

(2) Measure the resistance between evaporative emission

purge solenoid side connector terminal 1 and 2.

Standard value: 30

−−−−

34

Ω

Ω

Ω

Ω

[at 20

°°°°

C (68

°°°°

F)]

Q: Is the resistance at the standard value?

YES : Go to Step 4.
NO : Replace the evaporative emission purge solenoid.

Then go to Step 12.

STEP 4. Check the power supply voltage at evaporative
emission purge solenoid harness side connector B-04.
(1) Disconnect the connector B-04 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 2 and ground.

•

Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK"(OFF) position.

Q: Is the voltage normal?

YES : Go to Step 6.
NO : Go to Step 5.

STEP 5. Check connector A-21X at MFI relay for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between MFI relay connector A-

21X terminal 1 and evaporative emission purge
solenoid connector B-04 terminal 2 because of open
circuit or short circuit to ground. Then go to Step 12.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 12.

ACX02514 AI

EVAPORATIVE
EMISSION
PUREGE
SOLENOID
VALVE

CONNECTOR:B-04

AKX00342

AKX01502

B-04 HARNESS SIDE
CONNECTOR

1

2

AE

AK000555AB

CONNECTOR : A-21X

MFI RELAY

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-283

STEP 6. Check the power supply voltage at PCM connector
C-39 by backprobing
(1) Do not disconnect the connector C-39.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 34 and ground by

backprobing.

•

Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK"(OFF) position.

Q: Is the voltage normal?

YES : Go to Step 9.
NO : Go to Step 7.

STEP 7. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 12.

STEP 8. Check for open circuit and short circuit to ground
between evaporative emission purge solenoid connector
B-04 terminal 1 and PCM connector C-39 terminal 34.
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.

AK000301

C-39 CONNECTOR
HARNESS SIDE VIEW

1
9

24

2

10 11
25

3

12
26

4

13
27

5

19
32

6

20 21
33

7

22
34

8

23
35

14
28

1516
29

17

30

18

31

AC

AK000280

CONNECTOR : C-39

PCM

AW

ACX02514 AI

EVAPORATIVE
EMISSION
PUREGE
SOLENOID
VALVE

CONNECTOR:B-04

AK000280

CONNECTOR : C-39

PCM

AW

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-284

STEP 9. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection(

P.00E-2

). Then go to Step 12.

STEP 10. Check for harness damage between MFI relay
connector A-21X terminal 1 and evaporative emission
purge solenoid connector B-04 terminal 2.
Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO : Repair it. Then go to Step 12.

AK000280

CONNECTOR : C-39

PCM

AW

AK000555AB

CONNECTOR : A-21X

MFI RELAY

ACX02514 AI

EVAPORATIVE
EMISSION
PUREGE
SOLENOID
VALVE

CONNECTOR:B-04